Update. Okay, so I tried again today. Oven has been checked, new baking powder and Softasilk flour were used. This time I got a good result from the one baked in the oven and not the one baked in the convection oven. The only thing I did differently is I put the pan that I poured first into the convection oven and the pan I poured last into the gas oven. So I guess it must be my mixer. I always get the worst results with the pan that is poured first. Should I have mixed it longer? Two weeks ago I got slightly better results when I mixed it a little longer than I did today. This is a very large volume recipe, maybe my 5 qt mixer just can't handle it? I do think it runs a lot faster than it should, maybe I should return it, I bought it last fall. Any suggestions are much appreciated, I'm totally discouraged now.